Pinterest just picked up a cool $100 million in funding led by Japanese online shopping giant Rakuten, placing its value in the region of $1.5 billion. That’s huge–bigger than Instagram–but perhaps justified if the Pinteresting effect is reverberating through e-commerce sites. Here’s some proof that it is: Shopify, which supplies the e-commerce back end to 25,000 online stores, asked its partners whether Pinterest users are buying anything. The results are impressive.

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Pinterest is now the third biggest referral source to Shopify’s partner sites after Facebook, and on par with Twitter.

Pinterest users shop big–the average price tag is double that of a buy from a Facebook user.

Visits from the social network have jumped 145% since January this year, and, as a source of revenue for stores Pinterest now contributes 17% of social media traffic–up from 1% in Q2 last year.